X%20Window%20Manager%20and%20Remote%20Displays

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X Window Managerand Remote Displays

• History and usage

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Interface history

1. Punch Cards and Dip Switches
2. Teletype and Glass teletype (output only)
3. Dumb Terminals (limited cursor)
4. Terminals w/ escape sequences(vt100)
5. VT220 w/ ReGIS
6. X Terminals

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The beginning

• Punch Cards and dipswitches are the only way to
  interact with mainframes
• Eventually mainframes begin to include a single
  glass teletype, which displays text like error
  messages and job notifications
• Finally terminals are connect by serial ports
  with multiple terminals being connected at the
  same time

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DEC sets the standard

• The year is 1978
• DEC introduces the VT100 which supports the ANSI
  standard X3.64 (ASCII)
• Uses a standard intel 8080 processor to handle
  the command processing
• Basic text input/output and with limited cursor
  movement. Putty is a vt100 emulator.

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W and X

• Developers at MIT needed a graphical system that
  could work across multiple platforms
• The existing windowing System Was called W
• X version 1 was completed in 1984
• Rapid development cycle led to X version 6
  release in 1985
• X version 10 is the first to be widely deployed

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X11 and Xfree86

• Originated in 1992 from X386 server
• Quickly became the de-facto standard for intel
  machines
• The current Linux implementation is based off
  Xfree86
• Complies with the same standards as other X
  clients for Mac OSX, Solaris, Aix, BSD, etc.

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X Model

• X is a client server model
• Most machines actually have three processes
  running
• XDM is the X Display Manager
• Xserver which manages all the clients
• And X which is the main X client and spawns are
  child clients
• Finally the window manager is running on top of X

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